However, for characters outside the 7 bit, such as most UTF-8 characters, this leads to a problem in which Ruby fails to concatenate the string, even if it's technically within a compatible domain.
decoded = @filters.base64_decode('4pyF') # "✅" as base64
assert_equal("✅ ✅", "✅ " + decoded)
#=> Minitest::UnexpectedError: Encoding::CompatibilityError: incompatible character encodings: UTF-8 and ASCII-8BIT
To solve this problem and allow decoding emojis, I propose we attempt to change the encoding of the base64-decoded string, test if it's in the correct domain, and revert otherwise.
Ruby's
Base64.*decode64functions return strings encoded in theEncoding::ASCII_8BITscheme.Ruby's string append has a special case if the string being appended is encoded over 7 bits, meaning that this works flawlessly:
However, for characters outside the 7 bit, such as most UTF-8 characters, this leads to a problem in which Ruby fails to concatenate the string, even if it's technically within a compatible domain.
To solve this problem and allow decoding emojis, I propose we attempt to change the encoding of the base64-decoded string, test if it's in the correct domain, and revert otherwise.